# LDO vs Non-LDO voltage regulators with high input

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#### dksoba

##### Member level 2
LDO vs Non-LDO

I think I understand what the difference is for LDO vs non-LDO voltage regulators, which is than an LDO voltage regulator needs a smaller in vs out voltage difference. AKA a 5V LDO can regulate to 5V at 5.5V where a non-LDO would need 7V to regulate to 5V.

My question is, if you have a 24V power supply, and you need a 5V regulated supply, using a non-LDO will generate a lot of heat. If you use an LDO, will the power consumption be less?

Matt

#### teodor

##### Junior Member level 1
Re: LDO vs Non-LDO

No, the dissipated power will be the same. From the formula for power: P=U.I , where U=24-5=19V in both cases, current is the same in both cases => P(power) will be the same. If you want to eliminate heat, try using step-down(buck) converter, for example LM2576.

#### srizbf

Re: LDO vs Non-LDO

as long as it is a linear regulator ,
no difference in power consumption equation between an LDO and Non-LDO regs.

LDOs have an advantage of minimum input voltage requirement.

srizbf
1stmay2010

#### cesczhang

##### Junior Member level 2
LDO vs Non-LDO

Yes,you'd better use a step-down convertor

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